Eustachian tube teratoma: A case report

Figure 1 Endoscopic appearance and intraoperative appearance of the patient’s teratoma. A: Otoscopic examination demonstrated a large amount of pus in the left external auditory canal (white arrowhead) and a fleshy polyp at a deeper site (black arrowhead); B: The part of the mass in the tympanum and external auditory canal appeared as a fleshy polyp (arrowhead); C: “Hairs” were present on the surface of the mass and cartilage was surrounded by the mass in part of the eustachian tube (arrowhead).

Figure 2 High-resolution computed tomography scan of the patient’s temporal bone. Computed tomographic imaging showed a well-circumscribed, mixed density tumor (white arrowhead) with a fat density area (black arrowhead) located in the eustachian tube.

Figure 3 Magnetic resonance imaging of the patient’s head and neck. A, D, G: Three-dimensional (3D) T2 weighted image (WI); B, E, H: Fat suppression (FS) 3D T1WI; C, F, I: FS 3D T1WI with contrast (C+); A-C: Magnetic resonance (MR) images in the transverse plane showed the part of the mass which was a homogeneous lesion with slightly higher signal intensity and with enhancement (white arrowheads) in the tympanum and external auditory canal; D-F, G-I: MR images in the transverse plane showed the part of the mass which was a well-defined, homogeneous lesion with high signal intensity along the left eustachian tube (white arrowheads), and on FS 3D T1WI, a lesion with decreased signal intensity consistent with macroscopic fat and with a contrast-enhancing rim (black arrowhead) was seen.

Figure 4 Histopathological appearance of the patient’s resected tumor mass. A: Photomicrograph of the eustachian tube teratoma shows a mass with keratinized squamous epithelium (arrowheads) and chronic inflammatory cells (white arrows); B: Squamous epithelium (black arrows), adipose tissue (*) and sebaceous glands (arrowheads); C and D: Adipose tissue (*) and mature skeletal muscle tissue (arrowheads). All images are original magnification of × 100.